I would like to know how to invoke the Windows Security Dialog (press ctrl+alt+del on a windows workstation NOTE: I don\'t want the task manager!) programmatically.
You might want to take a look at the SendInput hook in User32:
http://msdn.microsoft.com/en-us/library/ms646310(VS.85).aspx
and
http://pinvoke.net/default.aspx/user32/SendInput.html